The FPG, 2hPG, HbA1C, CRP, IL-6, visfatin, JAZF1, HOMA-IR, baPWV, and EAT thickness of the Complication Group were all higher than those of the Diabetes Group and the Healthy Control Group, and the JAZF1 and FIns of the Complication Group and the Diabetes Group were lower than those of the Healthy Control Group, with statistical significance (P < 0.05, respectively), JAZF1 of the Complication Group was lower than that of the Diabetes Group (P < 0.05). This evidence concerns the gene NAMPT and diabetes mellitus.